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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1a9eac6ac710356cd4bc2cd56f6bd8170bd266a79c87734cccfcc59a708dea83' 
  AND token = 'PTs+860jjaV2pjmnNLik3VswbUt01D4Yx+GkludLpH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00803

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}